1 /*
2  *  OpenVPN -- An application to securely tunnel IP networks
3  *             over a single TCP/UDP port, with support for SSL/TLS-based
4  *             session authentication and key exchange,
5  *             packet encryption, packet authentication, and
6  *             packet compression.
7  *
8  *  Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License version 2
12  *  as published by the Free Software Foundation.
13  *
14  *  This program is distributed in the hope that it will be useful,
15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *  GNU General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22  */
23 
24 #ifndef PROXY_H
25 #define PROXY_H
26 
27 #include "buffer.h"
28 #include "misc.h"
29 
30 /* HTTP CONNECT authentication methods */
31 #define HTTP_AUTH_NONE   0
32 #define HTTP_AUTH_BASIC  1
33 #define HTTP_AUTH_DIGEST 2
34 #define HTTP_AUTH_NTLM   3
35 #define HTTP_AUTH_NTLM2  4
36 #define HTTP_AUTH_N      5 /* number of HTTP_AUTH methods */
37 
38 struct http_custom_header {
39     const char *name;
40     const char *content;
41 };
42 
43 #define MAX_CUSTOM_HTTP_HEADER 10
44 struct http_proxy_options {
45     const char *server;
46     const char *port;
47 
48 #define PAR_NO  0   /* don't support any auth retries */
49 #define PAR_ALL 1   /* allow all proxy auth protocols */
50 #define PAR_NCT 2   /* disable cleartext proxy auth protocols */
51     int auth_retry;
52 
53     const char *auth_method_string;
54     const char *auth_file;
55     const char *http_version;
56     const char *user_agent;
57     struct http_custom_header custom_headers[MAX_CUSTOM_HTTP_HEADER];
58     bool inline_creds;
59 };
60 
61 struct http_proxy_options_simple {
62     const char *server;
63     const char *port;
64     int auth_retry;
65 };
66 
67 struct http_proxy_info {
68     bool defined;
69     int auth_method;
70     struct http_proxy_options options;
71     struct user_pass up;
72     char *proxy_authenticate;
73     bool queried_creds;
74 };
75 
76 struct http_proxy_options *init_http_proxy_options_once(struct http_proxy_options **hpo,
77                                                         struct gc_arena *gc);
78 
79 struct http_proxy_info *http_proxy_new(const struct http_proxy_options *o);
80 
81 void http_proxy_close(struct http_proxy_info *hp);
82 
83 bool establish_http_proxy_passthru(struct http_proxy_info *p,
84                                    socket_descriptor_t sd,  /* already open to proxy */
85                                    const char *host,        /* openvpn server remote */
86                                    const char *port,          /* openvpn server port */
87                                    struct event_timeout *server_poll_timeout,
88                                    struct buffer *lookahead,
89                                    volatile int *signal_received);
90 
91 uint8_t *make_base64_string2(const uint8_t *str, int str_len, struct gc_arena *gc);
92 
93 uint8_t *make_base64_string(const uint8_t *str, struct gc_arena *gc);
94 
95 #endif /* PROXY_H */
96